Error installing FlashList

Current behavior

I am trying to use FlashList in React Native but am experiencing issues when trying to import the compiled version. I am having the same issue as https://github.com/Shopify/flash-list/issues/942

If I import FlashList with import { FlashList } from '@shopify/flash-list my UI crashes with a hermes error:
TypeError: Cannot read property '__extends' of undefined, js engine: hermes

If I instead import it from the index, as recommended in https://github.com/Shopify/flash-list/issues/942 - import { FlashList } from '@shopify/flash-list

FlashList works but I get a flood of Type errors:

Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(213,11): error TS2345: Argument of type 'T | undefined' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(238,11): error TS2345: Argument of type 'T | undefined' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(248,11): error TS2345: Argument of type 'T | undefined' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(259,11): error TS2345: Argument of type 'T | undefined' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(274,31): error TS7030: Not all code paths return a value.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(369,11): error TS2322: Type '(props: object, children: React.ReactNode[]) => React.JSX.Element' is not assignable to type '(props?: object | undefined, children?: ReactNode) => ReactNode'.
  Types of parameters 'props' and 'props' are incompatible.
    Type 'object | undefined' is not assignable to type 'object'.
      Type 'undefined' is not assignable to type 'object'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(383,11): error TS2322: Type '(event: NativeSyntheticEvent<NativeScrollEvent>) => void' is not assignable to type '(rawEvent: ScrollEvent, offsetX: number, offsetY: number) => void'.
  Types of parameters 'event' and 'rawEvent' are incompatible.
    Type 'ScrollEvent' is missing the following properties from type 'NativeSyntheticEvent<NativeScrollEvent>': currentTarget, target, bubbles, cancelable, and 10 more.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(520,11): error TS2769: No overload matches this call.
  Overload 1 of 2, '(props: PureComponentWrapperProps): PureComponentWrapper', gave the following error.
    Type '(index: number) => React.JSX.Element' is not assignable to type '(arg: unknown) => Element | null'.
      Types of parameters 'index' and 'arg' are incompatible.
        Type 'unknown' is not assignable to type 'number'.
  Overload 2 of 2, '(props: PureComponentWrapperProps, context: any): PureComponentWrapper', gave the following error.
    Type '(index: number) => React.JSX.Element' is not assignable to type '(arg: unknown) => Element | null'.
      Types of parameters 'index' and 'arg' are incompatible.
        Type 'unknown' is not assignable to type 'number'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41[563](https://github.com/leather-io/mono/actions/runs/15013601025/job/42186702268?pr=1171#step:4:579)c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(618,11): error TS2345: Argument of type 'RenderTarget | undefined' is not assignable to parameter of type 'RenderTarget'.
  Type 'undefined' is not assignable to type 'RenderTarget'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(630,28): error TS2604: JSX element type 'PassedComponent' does not have any construct or call signatures.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(630,28): error TS2786: 'PassedComponent' cannot be used as a JSX component.
  Its type 'ReactElement<any, string | JSXElementConstructor<any>> | ComponentType<{}>' is not a valid JSX element type.
    Type 'ReactElement<any, string | JSXElementConstructor<any>>' is not assignable to type 'ElementType'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(645,45): error TS2345: Argument of type 'RenderTarget | undefined' is not assignable to parameter of type 'RenderTarget'.
  Type 'undefined' is not assignable to type 'RenderTarget'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(651,7): error TS2322: Type 'T | undefined' is not assignable to type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(679,45): error TS2345: Argument of type 'RenderTarget | undefined' is not assignable to parameter of type 'RenderTarget'.
  Type 'undefined' is not assignable to type 'RenderTarget'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/FlashList.tsx(707,9): error TS2769: No overload matches this call.
  Overload 1 of 2, '(props: PureComponentWrapperProps): PureComponentWrapper', gave the following error.
    Type '(index: number) => JSX.Element' is not assignable to type '(arg: unknown) => Element | null'.
      Types of parameters 'index' and 'arg' are incompatible.
        Type 'unknown' is not assignable to type 'number'.
  Overload 2 of 2, '(props: PureComponentWrapperProps, context: any): PureComponentWrapper', gave the following error.
    Type '(index: number) => JSX.Element' is not assignable to type '(arg: unknown) => Element | null'.
      Types of parameters 'index' and 'arg' are incompatible.
        Type 'unknown' is not assignable to type 'number'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/GridLayoutProviderWithProps.ts(158,7): error TS2322: Type '{ isOverridden?: boolean; type?: string | number | undefined; height?: number | undefined; width?: number | undefined; x?: number | undefined; y?: number | undefined; }' is not assignable to type 'Layout'.
  Types of property 'type' are incompatible.
    Type 'string | number | undefined' is not assignable to type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(323,15): error TS2532: Object is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(323,40): error TS2532: Object is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(331,11): error TS2345: Argument of type 'T | undefined' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(336,9): error TS2532: Object is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(339,7): error TS2532: Object is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(340,9): error TS2322: Type 'T | undefined' is not assignable to type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(362,9): error TS2345: Argument of type 'MasonryListItem<T>[] | undefined' is not assignable to parameter of type 'MasonryListItem<T>[]'.
  Type 'undefined' is not assignable to type 'MasonryListItem<T>[]'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(444,9): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(444,33): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(445,11): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(446,9): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(446,23): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(447,9): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(447,22): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(449,9): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/MasonryFlashList.tsx(450,9): error TS18048: 'token' is possibly 'undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/benchmark/useDataMultiplier.ts(16,5): error TS2322: Type 'T | {} | undefined' is not assignable to type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'T | {} | undefined'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(3,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(4,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(5,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(6,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(7,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(13,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(14,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(18,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(19,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(24,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(28,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(29,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(33,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(34,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(35,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(36,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(37,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(38,3): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(40,24): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/index.ts(42,10): error TS1205: Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.
Error: ../../node_modules/.pnpm/@shopify+flash-list@1.8.0_@babel+runtime@7.26.0_react-native@0.74.1_@babel+core@7.24.6__fd22fd1027109ff2ca7e41563c111e1b/node_modules/@shopify/flash-list/src/native/auto-layout/AutoLayoutView.tsx(53,7): error TS2722: Cannot invoke an object which is possibly 'undefined'.

Expected behavior

I expect to:

• be able to import FlashList from the main folder and for it to work correctly
  • import { FlashList } from '@shopify/flash-list'
• or to import it from src but to not have type errors

To Reproduce

Platform:

• [ X ] iOS
• [ X ] Android

Environment

I tried 1.8.0 and also the latest beta version v2.0.0-alpha.10

Start by reproducing the package import and TypeScript errors reported for React Native and Hermes. Read FlashList.tsx, GridLayoutProviderWithProps.ts, and MasonryFlashList.tsx at the listed error locations, then run the project's TypeScript check. Done means the reported import no longer crashes and the listed type errors are resolved.